19. Certainly Murray's preoccupation with the task of editing the Oxford English Dictionary begot a kind of monomania, but it must be regarded as a ......... or at least an innocuous one.
a) tame
b) tendentious
c) meretricious
d) beneficent

(d)

20. Nutritionists declare that the mineral selenium, despite its toxic aspects, is ............. to life, even though it is needed in extremely small quantities.
a) destructive
b) insignificant
c) essential
d) extraneous